diff --git a/hardware/lora-module.md b/hardware/lora-module.md
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+# RAK4631
+datasheet: <https://docs.rakwireless.com/product-categories/wisblock/rak4631/datasheet/>
+
+## NOTES
+* compatible with RAK5005-O baseboard. 
+
+## SUPPORTED PROTOCOLS
+* LoRA
+* BLE
+
+## POWER ANALYSIS
+max power consumption: 12.5mA (@3.6V assumed) = 46.25mW
+battery: 5900mAh @ 3.7V -> 21830mWh
+runtime: batt_capacity/power_consumption = 472h
diff --git a/hardware/power.md b/hardware/power.md
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+# BATTERY
+* lipo can charge at 1C
+* 5900mAh -> 5.9A
+
+## CHARGERS
+1. [5V 2A USB-C](https://www.amazon.com/DWEII-Converter-Step-Up-Charging-Protection/dp/B09YD5C9QC/)
+2. [5V 2A](https://www.amazon.com/Ruiwaer-Discharge-Integrated-Adjustable-Charging/dp/B08QHVW5J8)
+    * have on hand (i think) 
+## BMS
+2. [3S 60A](https://www.amazon.com/dp/B0B9MMZWXC)
+
+# SOLAR
+* mppt charge controllers: 
+1. <https://www.amazon.com/Waveshare-Solar-Power-Manager-Regulated/dp/B0CT2ZBML9>
+2. <https://www.amazon.com/4-4-6-5V-Lithium-Battery-Charger-Controller/dp/B08DY28BXW>
+